Document oewje3M84DpgDmd6gO9MDBR0E

Industrial Hwlsns Dlgaht August, 1962 770 Basic Theory of Gas Indicator Tub* Calibration. B, E. Seltsman. Am. Ind. Hyg. Assn. J. 23. IUU6 (Mar.+Apr. 1962)* Theoretical mathematical expression* are developed for Indicator tab* calibration showing effects of gas* concentration, sample volume, Aow rate, labs diameter, (rota sis*, sod experimental errors. la tb* ososl ssb* *h* kinetic rat* of gas sorption l* controlling, sad atain length is proportional to tb* io|artihoi of tb* product of gaa concentration sad sampi* volume. Plow rat* must b* prseitBiy replicated. Formula* ar given for other cates wbr partial and complete saturation of tbs BUiaad ponton of tb* indicator gal occur. Tb*B expree* alona should aid in optimal design and development as wall ssMse of indicator tub**. Author's sbst. 'ni dfsriirtfliiAf^afOtoald* ia lb* Fra* Atmosphere, W. Bleebol. Tellus ^4," <7*90 tCeb. 1962). (Tetlua. Editor, 114 UpdhagansgaunrBtotbhotm.-BondBu^ '} t ' * * * Variation* p'f carbon.dioxide In the et'mosp>iefi bi[v# b*eo lnv**tig*t#d hy lh* analyiU ot*lB6 flpafr sample* uh>n]>'from*anal'tyleaeMat heightl up to Sam*, d.brinji |h*-pdVlo<f IW-lpMj* , ^ *% Tb* 'carbon dioxide concentration Changti considerably Trdm on* anojbeV- Above' 1,Q0Q n > ** t* the ;si)Je is 106 to 320 pjtin tbs sveVege 114 pp;n, ``The range end'averagd both iaerahea tdwhtd* # ' ,4b* grounds A teaional variation ^concentration ip noieih ,tbd amplitude ofth# variation d*. 'crease* with increasing height abpvh ths'grbund. The roirfimumpccur* sufnmsr .andehe fbaxi. mum in wintar at all altitudes* Soma of tbs syasonal.variations at ground feyel aa previously obtained from tb* Scandinavian network for carbon dionid* sampling do not show up in the analyst* from upper levels. ** Public Health Eng. Abate. 7tS Tb* Determination of Sulfur Trioxide in Flu* Cases, H, Cokaifyr and K. Rosa. i. bit, Fu.l 15, 177-179 (Apr. 1,62). A simplified method baa been developed for the rapid determination of sulfur trU oxide In Au* gsaaa. Tb* sulfur trioxide la retained by condensation as sulfuric acid in a certain temperature range below Uj dewpoint, Tb* collecting apparatus ia easy to oparata and allows gaa sampla rates aa high aa 10 l./mtn. to be achieved. The sulfuric acid is estimated by a simple acid baas titration. Thus in lass than IS minutes a compute determination may be carried out and the apparatus prepared for thenext teat. Tbs method described baa proved.. 'reliable and more convenient than the methods previously used. -- APCA Abate. 77) Spectropbotometrlc Determination of Nitric Oxide In Auto Exhaust, 8. V. Nlckele and J. Harkins. Anal. Chum. U, 933-9** <Jufy 1962). A convenient and rapid procedure for the oxidation of nitric oxide in auto exhauat ( to nitrogen dioxide baa been developed which permit* determination by direct apectrophoto- * metric absorbance measurement*. The method ia much faster than the phanoldiaulfonio add method commonly ueed, and the reeulte of ihe two method* are comparable. A novel record ing spectrophotometer for following the oxidation of nitric oxide ia also described. Preliminary observations suggest that an apparatus for continuous determination could be developed by eom- pressing and expanding the sample under empirically selected conditions prior to the spectro photometry. Authors' sbst. f 774 The Determination of Small Amount* of Nitrogen Oxides in Flue Oases. W. Leith*. idikrochtm. Acta No*. 1-2. I6o-i?0 (i%2), (Mikrochimica Acta, Springer-Verlag, Moelkar* bastei ft, Wien 1, Austria a). * A method if doped bad for determining nitrogen oxides in flue gases. The gaa sample ia shaken .with diluki liydrogAn peroxide and tho re suiting nltfic *4 id ia titrated aeidimeipically< U a'foerrflng agunt.is added thu absorption of.lh* nitrogen oxides* ie'practically complete after a* Iftti* as ft minutes shaking. Public Hoaltb.kng. Abate. Address not in current List of Perlodinte.